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fs: cifs: replace CURRENT_TIME by other appropriate apis
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CURRENT_TIME macro is not y2038 safe on 32 bit systems.

The patch replaces all the uses of CURRENT_TIME by current_time() for
filesystem times, and ktime_get_* functions for authentication
timestamps and timezone calculations.

This is also in preparation for the patch that transitions vfs
timestamps to use 64 bit time and hence make them y2038 safe.

CURRENT_TIME macro will be deleted before merging the aforementioned
change.

The inode timestamps read from the server are assumed to have correct
granularity and range.

The patch also assumes that the difference between server and client
times lie in the range INT_MIN..INT_MAX.  This is valid because this is
the difference between current times between server and client, and the
largest timezone difference is in the range of one day.

All cifs timestamps currently use timespec representation internally.
Authentication and timezone timestamps can also be transitioned into
using timespec64 when all other timestamps for cifs is transitioned to
use timespec64.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Deepa Dinamani <[email protected]>
Reviewed-by: Arnd Bergmann <[email protected]>
Cc: Steve French <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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@deepa-hub @torvalds
deepa-hub authored and torvalds committed May 9, 2017
1 parent 51aad0a commit e37fea5
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Showing 3 changed files with 23 additions and 19 deletions.
4 changes: 3 additions & 1 deletion fs/cifs/cifsencrypt.c
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Original file line number Diff line number Diff line change
Expand Up @@ -478,6 +478,7 @@ find_timestamp(struct cifs_ses *ses)
unsigned char *blobptr;
unsigned char *blobend;
struct ntlmssp2_name *attrptr;
struct timespec ts;

if (!ses->auth_key.len || !ses->auth_key.response)
return 0;
Expand All @@ -502,7 +503,8 @@ find_timestamp(struct cifs_ses *ses)
blobptr += attrsize; /* advance attr value */
}

return cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
ktime_get_real_ts(&ts);
return cpu_to_le64(cifs_UnixTimeToNT(ts));
}

static int calc_ntlmv2_hash(struct cifs_ses *ses, char *ntlmv2_hash,
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10 changes: 5 additions & 5 deletions fs/cifs/cifssmb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -478,14 +478,14 @@ decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
* this requirement.
*/
int val, seconds, remain, result;
struct timespec ts, utc;
utc = CURRENT_TIME;
struct timespec ts;
unsigned long utc = ktime_get_real_seconds();
ts = cnvrtDosUnixTm(rsp->SrvTime.Date,
rsp->SrvTime.Time, 0);
cifs_dbg(FYI, "SrvTime %d sec since 1970 (utc: %d) diff: %d\n",
(int)ts.tv_sec, (int)utc.tv_sec,
(int)(utc.tv_sec - ts.tv_sec));
val = (int)(utc.tv_sec - ts.tv_sec);
(int)ts.tv_sec, (int)utc,
(int)(utc - ts.tv_sec));
val = (int)(utc - ts.tv_sec);
seconds = abs(val);
result = (seconds / MIN_TZ_ADJ) * MIN_TZ_ADJ;
remain = seconds % MIN_TZ_ADJ;
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28 changes: 15 additions & 13 deletions fs/cifs/inode.c
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Original file line number Diff line number Diff line change
Expand Up @@ -322,9 +322,9 @@ cifs_create_dfs_fattr(struct cifs_fattr *fattr, struct super_block *sb)
fattr->cf_mode = S_IFDIR | S_IXUGO | S_IRWXU;
fattr->cf_uid = cifs_sb->mnt_uid;
fattr->cf_gid = cifs_sb->mnt_gid;
fattr->cf_atime = CURRENT_TIME;
fattr->cf_ctime = CURRENT_TIME;
fattr->cf_mtime = CURRENT_TIME;
ktime_get_real_ts(&fattr->cf_mtime);
fattr->cf_mtime = timespec_trunc(fattr->cf_mtime, sb->s_time_gran);
fattr->cf_atime = fattr->cf_ctime = fattr->cf_mtime;
fattr->cf_nlink = 2;
fattr->cf_flags |= CIFS_FATTR_DFS_REFERRAL;
}
Expand Down Expand Up @@ -586,9 +586,10 @@ static int cifs_sfu_mode(struct cifs_fattr *fattr, const unsigned char *path,
/* Fill a cifs_fattr struct with info from FILE_ALL_INFO */
static void
cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,
struct cifs_sb_info *cifs_sb, bool adjust_tz,
struct super_block *sb, bool adjust_tz,
bool symlink)
{
struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
struct cifs_tcon *tcon = cifs_sb_master_tcon(cifs_sb);

memset(fattr, 0, sizeof(*fattr));
Expand All @@ -598,8 +599,10 @@ cifs_all_info_to_fattr(struct cifs_fattr *fattr, FILE_ALL_INFO *info,

if (info->LastAccessTime)
fattr->cf_atime = cifs_NTtimeToUnix(info->LastAccessTime);
else
fattr->cf_atime = CURRENT_TIME;
else {
ktime_get_real_ts(&fattr->cf_atime);
fattr->cf_atime = timespec_trunc(fattr->cf_atime, sb->s_time_gran);
}

fattr->cf_ctime = cifs_NTtimeToUnix(info->ChangeTime);
fattr->cf_mtime = cifs_NTtimeToUnix(info->LastWriteTime);
Expand Down Expand Up @@ -659,7 +662,6 @@ cifs_get_file_info(struct file *filp)
FILE_ALL_INFO find_data;
struct cifs_fattr fattr;
struct inode *inode = file_inode(filp);
struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);
struct cifsFileInfo *cfile = filp->private_data;
struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
struct TCP_Server_Info *server = tcon->ses->server;
Expand All @@ -671,7 +673,7 @@ cifs_get_file_info(struct file *filp)
rc = server->ops->query_file_info(xid, tcon, &cfile->fid, &find_data);
switch (rc) {
case 0:
cifs_all_info_to_fattr(&fattr, &find_data, cifs_sb, false,
cifs_all_info_to_fattr(&fattr, &find_data, inode->i_sb, false,
false);
break;
case -EREMOTE:
Expand Down Expand Up @@ -753,7 +755,7 @@ cifs_get_inode_info(struct inode **inode, const char *full_path,
}

if (!rc) {
cifs_all_info_to_fattr(&fattr, data, cifs_sb, adjust_tz,
cifs_all_info_to_fattr(&fattr, data, sb, adjust_tz,
symlink);
} else if (rc == -EREMOTE) {
cifs_create_dfs_fattr(&fattr, sb);
Expand Down Expand Up @@ -1363,9 +1365,9 @@ int cifs_unlink(struct inode *dir, struct dentry *dentry)
cifs_inode = CIFS_I(inode);
cifs_inode->time = 0; /* will force revalidate to get info
when needed */
inode->i_ctime = current_fs_time(sb);
inode->i_ctime = current_time(inode);
}
dir->i_ctime = dir->i_mtime = current_fs_time(sb);
dir->i_ctime = dir->i_mtime = current_time(dir);
cifs_inode = CIFS_I(dir);
CIFS_I(dir)->time = 0; /* force revalidate of dir as well */
unlink_out:
Expand Down Expand Up @@ -1633,7 +1635,7 @@ int cifs_rmdir(struct inode *inode, struct dentry *direntry)
cifsInode->time = 0;

d_inode(direntry)->i_ctime = inode->i_ctime = inode->i_mtime =
current_fs_time(inode->i_sb);
current_time(inode);

rmdir_exit:
kfree(full_path);
Expand Down Expand Up @@ -1806,7 +1808,7 @@ cifs_rename2(struct inode *source_dir, struct dentry *source_dentry,
CIFS_I(source_dir)->time = CIFS_I(target_dir)->time = 0;

source_dir->i_ctime = source_dir->i_mtime = target_dir->i_ctime =
target_dir->i_mtime = current_fs_time(source_dir->i_sb);
target_dir->i_mtime = current_time(source_dir);

cifs_rename_exit:
kfree(info_buf_source);
Expand Down

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